Improvement in pump-pistons



TO ALLv WHOM IT MAY CONCERN:.

JOHN WOOD, OF i FRANKLINfPENNSYLVANIA,

Letters Patent No. 81,451, dated )ingaat 25, 1868 turner/Burnt INrUMr-PIsToNs.

@tige ttml'e aferra in in tigen rttets atnxt 'mit mating artt nf tigesame.

Bo it known that I, JOHN WOODof Franklin, in the county of IVenango, andState of Pennsylvania, have invented a new and improved Pump-Piston; andI do hereby declare that the following' is a full, clear, and

exact description thereof, which `will enable others skilled in the artto make and use thc-same, reference being had to theaccompanyingdrawings, 'forming part of this specification.

This invention relates to a new and improved method of constructingpump-pistons or valve-boxes, whereby the sa'meare selfexpanding,a.nd arethus'rendered incredurable. It consists of a valve-seat and ball orglobevalve, secured to the`piston by a scrcwthread,`the upper part ofthe piston boing provided with an expanding y packing, which, when thepiston is raised, is pressedout against the pump-cylinder, so that itfits perfectly tight within the sonic.

VThe drawing represents a central vertical section of my piston andvalve, the red lmes'showing the pumpbarrel or cylinder'. i A

A is the upper section of the pistou; B is the `middle section of thepiston C is the lower section oi' the same `a are projections or fingersin the section A, by means of which the packing P is kept in position.

a are pegs, by .means of whichthe packing P is secured to the piston. bis the valve; e' are ribs in the section B, lby means of which the valveb is guided in such a way as to allow the passage of liquids when thepiston is moving down.

P is the packing;l d are screw-threads, by means of which the piston'isattached to the pistorrrod.

The piston or valve-box is constructed in the sections A B C, which saidsections are secured together by screw-threads, the object of which isthat thereby the piston may be easily taken apart when the valve V orthe packing P is fouled or in want of repair.

The upper section A is a hollow cylinder, having on its under side ascrew-thread, by means oi' which it is fastened to the section C. Saidsection'A has on`its upper side a stirrup, F, in the ordinary form,terminating l in a scrcwethread, d, byy means of which it is attached tothe piston-rod. l

Upon the upper side of said section are projections or fingers a, eitherattached to the same or being a part thereof,which, with the stirrup F,serve to prevent the packing P from being pressed inward or away fromthe pump-cylinderby the force of the liquid above the packing, and tokeep said packing in position.

To said upper section A of the piston is secured, by the pegs a', a,h-ollow cylindrical packing of leather o1' othcr suitable material,extending above said section A, in the-shape of a cup, and kept inposition, as above described, by the fingers a and the stirrupF, so thenwhen the piston is iilled with any liquid, said packing P is expandedoutwards against the pump-barrel or cylindemiitting the same tightly, sothat no fluid can escape by said packingwhcn said piston is raised.

Said section B is also a hollow cylinder, secured, as above described,to the sections A and C, by screwthreads, as shown in th'c drawings. 4

To th'e inside of saidfsection B, arc either attached or made part ofthe samethc ribs o, serving as a guide for the ball-valve o in itsupward and downward motion, and allowing a space around the ball-valveu, through which the liquid can pass when thcpiston is moving down.

The section O is also a hollow cylinder, scoured to the section B by ascrcv."tli1'cad, as shown in the drawing,-having on its under sidea'stirrup, G, terminating in a screw-thread, c'-, by means of which itis attached' to a guide or rod.

' Upon the upper edge oi' said section C is the valve-scat, in which thevalve b rests.

The opei'atiou is such that thc pressure of thc water or other liquid,inside of the packing P, always keeps the saine perfectly tight.

Whenconstructed as above described, it constitutes a reliable anddurable pump-piston, for the raising of water or other liquids, andwhich may be easily taken apart for purposes of cleaning or repair. Iclaim aswncu', and desire to'sccurc by Letters Patent-'- Thel movablesections A B C, the packing P, the ball-valve V, and ribs e, arranged asherein described, for tbc purpose specified.

y i JOHN 'WOOD Witnesses:

A Pannen, A. P. WmTAunI'.

